ROUTE #1: Process
ROUTE #1: Chapter-by-Chapter
Methods and measurement-driven extension: Test whether different methods lead to the same results, and whether existing measures are sufficient

Sometimes, there may appear to be nothing wrong with the measurement procedure used in the original study or the measures selected (e.g., questions in a questionnaire) to measure the constructs you are interested in; at least on the surface. We say that these weaknesses do not appear on the surface because the authors report the findings from commonly used statistical tests that illustrate the findings to be reliable. However, just because they are reliable on the surface does not mean that they are valid. This reflects two types of bias that can creep into studies: mono-operation bias and mono-method bias. We discuss these briefly with examples to show you how these types of bias can present you with an opportunity to extend the original study.

The decision to (a) use different or additional variables to measure a construct, or (b) use different or additional methods to those used in the original study, can enable you to make a really interested contribution to the literature through your replication-based dissertation. In this sense, Route C: Extension can allow you to address a potential weakness in an original study, improve the construct validity of the original study, as well as deal with the potential dangers of mono-operation bias and mono-method bias.


The choice of extension that you can make is very specific to the study that you want to build on. Whilst we explain some of the broader justifications for replication-based dissertations in the section that follows, it is important to understand the specific reasons for making a particular type of extension. As a result, we explain more about making these decisions within the Lærd Dissertation site. However, it is worth noting that Route C: Extension does provide you with many ways to build on an existing study, and potentially make a more original contribution than Route B: Generalisation.

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